However, while we often think of stretching a muscle like stretching a rubber band, muscles are actually comprised of various tissue types, which interact to make a complex material.

然而， 虽然我们经常认为拉伸肌肉就像拉伸橡皮筋一样，但实际上肌肉由各种组织类型组成，它们相互作用形成了一种复杂的材料。

This is kinda like how stretching out a rubber band makes it snap back even harder, except that cardiac muscle is actively contracting whereas the rubber band is passively going back to its relaxed state.

就像皮筋在拉张后的弹回力度更大，只不过心肌是在主动收缩，而皮筋是被动地回到它原本放松的状态。